Once-Habitable Lake Found on Mars
Space.com

A lake that might once have been habitable may have filled a crater for a long time on early Mars, new spacecraft images reveal.
NASA’s Mars Reconnaissance Orbiter (MRO) captured the images that suggest the debris-strewn Holden Crater once held a calm body of water that could have harbored life. There is so far no convincing evidence life does or ever did exist on Mars, however.
The crater debris includes a mix of broken boulders and smaller particles called megabreccia.